There have been a couple new
RADIO RELEASES recently that I've been trying out which led me to search for a fix for the ## codes not working (wanted to use Fieldtrial).
I ran into a
Post From Stroths with a cab that fixed it for me on the Jan. 14th 23518.
Install the cab (which will put an EPST tool shortcut in your start menu) and you should be able to use ## codes in your dialer.
Again, all thanks to Stroths, I didn't make this cab, just using it!